MainHandler is one such dangerous browser extension that should be avoided. Software packages that pass as free games, utilities, tools, media players, file downloaders, and other items are a common way for undesirable programs to penetrate a Mac computer. Furthermore, MainHandler may access the browser through sneaky means, such as malicious pop-ups and browser redirects. So, use extreme caution when browsing the internet. Because several anomalies will occur on a compromised internet application once this adware begins to impose alterations.
MainHandler is a browser hijacker
Similar to other browser hijackers, MainHandler is as dangerous as NanoAccess and DivisionType. Many computer users find these annoying. Without the Mac user’s permission, it modifies browser settings. Also, the adjustments it made had a negative impact on users’ browsing experiences, particularly online search. Instead of receiving an immediate response, MainHandler sends all search requests to its own server before publishing the results on the unwanted search provider.
MainHandler’s dominance of the browser is having an impact on more than just its search capabilities. Above all, it has the potential to show ads that are both hazardous and excessively obnoxious. The browser program can be sent to a separate undesirable landing page that has malware or adware on it.
Threat to Mac users’ online privacy
Security experts have shown that the purpose of this strategy to reroute search queries to adware servers is to gather internet user data. To increase their online sales, certain internet advertisers rely on data collection. In order to gather data, MainHandler’s creators and the majority of homepage hijackers use this intrusive method. Aside from generating ads for their invasively customized homepage, selling them to partners and online marketing colleagues could result in additional income.
We strongly advise removing MainHandler from the browser after seeing that it only causes problems and offers no advantages. As previously said, using a well-known search engine directly, such as Google, Bing, or Yahoo, is safer. The straightforward removal instructions for MainHandler and related threats are provided below.
Procedures to Remove MainHandler from Mac
This area contains comprehensive procedures to help you remove adware and potentially unwanted program from the computer.
Guide on this page are written in a manner that can be easily understand and execute by Mac users.
Quick Fix - Scan the Mac Computer with Combo Cleaner
Combo Cleaner is a trusted Mac utility application with complete antivirus and optimization features. It is useful in dealing with adware, malware, and PUP's. Moreover, it can get rid of adware like MainHandler. You may need to purchase full version if you require to maximize its premium features.
1. Download the tool from the following page:
2. Double-click the downloaded file and proceed with the installation.
3. In the opened window, drag and drop the Combo Cleaner icon onto your Applications folder icon.
4. Open your Launchpad and click on the Combo Cleaner icon.
5. Wait until antivirus downloads its latest virus definition updates and click on "Start Combo Scan" to start removing MainHandler.
6. Free features of Combo Cleaner include Disk Cleaner, Big Files finder, Duplicate files finder, and Uninstaller. To use antivirus and privacy scanner, users have to upgrade to a premium version.
Proceed with the rest of the removal steps if you are comfortable in manually removing malicious objects associated with the threat.
Step 1 : Delete MainHandler from Mac Applications
1. Go to Finder.
2. On the menu, click Go and then, select Applications from the list to open Applications Folder.
3. Find MainHandler or any unwanted program or suspicious item. It could be in disguise as a different file.
4. Drag MainHandler to Trash Bin to delete the application from Mac.
5. Right-click on Trash icon and click on Empty Trash.
Step 2 : Remove Browser Extensions that belongs to MainHandler
1. Locate the add-on or extension that is relevant to the adware. To do this, please follow the following depending on affected browser.
Safari - Choose Preferences from the Safari menu, then click the Extensions icon. This will open a window showing all installed extensions.
Chrome - Select Preferences from the Chrome menu, and then click the Extensions link found on the left pane.
Firefox - Choose Add-ons from the Menu. Look at both the Extensions and Plug-ins lists when it opens a new window.
2. Once you have located MainHandler, click on Remove or Uninstall, to get rid of it.
3. Close the browser and proceed to the next steps.
Step 3 : Delete Malicious Files that have installed MainHandler
1. Select and copy the string below to your Clipboard by pressing Command + C on your keyboard.
~/Library/LaunchAgents
2. Go to your Finder. From the menu bar please select Go > Go to Folder...
3. Press Command + V on your keyboard to paste the copied string. Press Return to go to the said folder.
4. You will now see a folder named LaunchAgents. Take note of the following files inside the folder:
- com.MainHandler
- unknown.download.plist
- unknown.ltvbit.plist
- unknown.update.plist
The term unknown is just a representation of the actual malware name. Attackers may masks the actual name with following:
- MainHandler
If you cannot find the specified file, please look for any unfamiliar or suspicious entries. It may be the one causing MainHandler to be present on your Mac. Arranging all items to see the most latest ones may also help you identify recently installed unfamiliar files. Please press Option + Command + 4 on your keyboard to arrange the application list in chronological order.
Important: Take note of all the suspicious files as you may also delete the same item on another folder as we go on.
5. Drag all suspicious files that you may find to Trash.
6. Please restart the computer.
7. Open another folder using the same method as above. Copy and Paste the following string to easily locate the folder.
~/Library/Application Support
8. Look for any suspicious items that are similar to the ones in Step 4. Drag them to the Trash.
9. Repeat the process on the following non-hidden folders (without ~):
/Library/LaunchAgents
/Library/LaunchDaemons
/Library/Application Support
10. Lastly, go to your Finder and open the Applications Folder. Look for subfolders with the following names and drag them to Trash.
- MainHandler
Optional : For locked files that cannot be removed, do the following:
1. Go to Launchpad, Utilities folder, open Activity Monitor.
2. Select the process you want to quit.
3. Click on Force Quit button.
4. You may now delete or remove locked files that belongs to MainHandler adware.
Step 4 : Double-check with MBAM Tool for Mac
1. Download Malwarebytes Anti-malware for Mac from this link:
2. Run Malwarebytes Anti-malware for Mac. It will check for updates and download if most recent version is available. This is necessary in finding recent malware threats including MainHandler.
3. If it prompts to close all running web browser, please do so. Thus, we advise you to PRINT this guide for your reference before going offline.
4. Once it opens the user interface, please click on Scan button to start scanning your Mac computer.
5. After the scan, Malwarebytes Anti-malware for Mac will display a list of identified threats, MainHandler is surely part of it. Be sure to select all items in the list. Then, click Remove button to clean the computer.
Step 5 : Remove MainHandler from Homepage and Search
Safari
- Open your Safari browser.
- Go to Safari Menu located on upper left hand corner, and then select Preferences.
- Under General tab, navigate to Default Search Engine section and select Google or any valid search engine.
- Next, be sure that "New Windows Open With" field is set to Homepage.
- Lastly, remove MainHandler from the Homepage field. Replace it with your preferred URL to be set as your default homepage.
Google Chrome
- Open Chrome browser.
- Type the following on the address bar and press Enter on keyboard : chrome://settings/
- Look for 'On Startup' area.
- Select 'Open a specific page or set of pages'.
- Click on More Actions and select Edit.
- Enter the desired web address as your home page, replacing MainHandler. Click Save.
- To set default search engine, go to Search Engine area.
- Click on 'Manage search engines...' button.
- Go to questionable Search Engine. Click on More Actions and Click 'Remove from list'.
- Go back to Search Engine area and choose valid entry from Search engine used in the address bar.
Mozilla Firefox
- Run Mozilla Firefox browser.
- Type the following on the address bar and hit Enter on keyboard : about:preferences
- On Startup area, select 'Show your home page' under 'When Firefox starts' field.
- Under Home Page field, type the desired URL to replace MainHandler settings.
- To configure default search engine, select Search on left sidebar to display settings.
- Under Default Search Engine list, please select one.
- On the same page, you have an option to Remove unwanted search engine.
Optional : If unable to change browser settings, execute these steps:
Some user complains that there is no way to change browser settings because it is grayed out by MainHandler. In such situation, it is important to check if there is unwanted profile. Please do the following:
1. Quit any running applications and launch System Preferences from your Dock.
2. Under System Preferences, click Profiles.
3. Select MainHandler or any relevant profile from the left pane. See image below.
4. At the bottom of this window, click minus [-] button to delete the account. Please refer to image above.
5. Close the Profiles window and open the affected browser to change all settings associated with MainHandler.
